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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

243626 puzzles downloaded.

  15       14     9         3 8  
    1                 11 13   6  
14 5       7         8     1   9
      9             10          
  1 13 6   2 16 7 15 10     3      
    2     15       11   7        
          12     1 16 14 5 6      
  11   7     1   8              
              8   7     4   3  
      4 9 5 10 16     11          
        7   13       12     14    
      8     3 1 2 9 13   10 6 5  
          16             7      
8   14     10         7       13 2
  4   12 15                 9    
  7 11         2     9       12  
Showing puzzle number: 656
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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